The Flexi Disc's

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Flexi discs are made all over the world, mostly they where made for advertisement or included in a music book as  instruction how to pay an instrument, for example I had one in the early seventies in a instruction book "How to play the 5-string banjo" The music flexi discs I collected are mostly made in Poland and Russia and mono recorded, here's wat I collected, 'till now
Maggie - Shaped Disc Blue